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Патент USA US2411079

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Nov. 12, 1946.
Filed Sept. 9, 1944'
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Patented Nov. 12, 1946
Gerhard H. J. Baule, Salina, N. Y.
Application‘ September 9, 1944,~Serial No. 553,394
1 Claim. (Cl. 128--339)
1 .
This invention relates to surgeons’ needles and
has for its object a method of attaching cords or
sutures to the shanks of needles leaving a maxi
the maximum diameter of suture must not be un
duly weakened so that the needle breaks when
being used. The breakage of needles, which are
mum amount of metal in a shank of minimum di
ameter with a suture of maximum diameter, thus
of but a few thousandths of an inch in diameter,
has heretofore been not an uncommon occurrence
and sometimes is the rule rather than the excep
producing a shank of maximum strength and
minimum outer diameter with the suture of maxi
mum diameter anchored therein.
This method of attaching sutures to the shanks
of needles includes expanding an outer end por
tion of the shank to a larger diameter than the
adjacent inner portion; forming a blind axial
recess in the shank of substantially the diame
ter of the suture to be attached thereto, the recess
The invention consists in the method and steps
hereinafter set forth and claimed.
In describing this invention, reference is had to
the accompanying drawing in which like charac
ters designate corresponding parts in all the
extending through the expanded portion and well
into the unexpanded portion of the shank; plac
Figure 1 is an elevation, partly in section, on an
enlarged scale, of a needle with suture or cord
ing the suture in the recess and contracting the
expanded portion, so that its inner diameter is
less than the suture and its outer face substan
Figure 2 is an elevation of the shank of the nee
tially flush with the outer face of the unexpanded
dle, partly in section on a greatly enlarged scale
illustrating the enlarging or expanding of the 20 portion of the shank. The axial recess may be
partly formed before the outer portion of the
outer end portion of the shank.
shank is expanded and completed after the ex
Figure 3 is a sectional view illustrating the com
panding operation or may be completely formed
plete formation of the blind axial recess in the
expanded portion and the adjacent unexpanded
portion of the shank with the recess of substan
tially the diameter of the suture to be attached,
after the expanding operation.
I designates the needle; 2 the shank thereof,
and 3 the cord or suture attached thereto. In
Figures 2 and 3, the outer. end portion] of the
omitted, of tapering the walls of the entrance or
shank is expanded before the blind recess is
mouth of the recess into a funnel shape extend
formed. It may be expanded in any suitable
ing from an intermediate point in the bore of the 3o manner, as by applying an axial compressing
expanded portion to the outer end of the shank.
force to this shank while holding the inner end
Figure 4 is a view similar to Figure 2 illustrat
portion 5 of the shank from expanding and con
ing a slight modi?cation of the method, wherein
trolling the expanding of the outer end portion 4
an axial bore is formed before the expanding op—
by means of suitable dies, this being something of
eration but the blind recess not completed until
forging operation. The end of the shank is
35 aprovided
after the expanding operation.
with a centering hole 6 for facilitating
Figure 5 is a. view showing the shank after the
drilling operations. After the shank is formed
expanding operation is performed on the shank
up, as shown in Figure 2, a blind recess ‘I is drilled
shown in Figure 4.
out, the diameter thereof being substantially that
Figure 6 is a view similar to Figure 5 showing 40 of the suture 3, so that the suture ?ts the recess
the completion of the blind recess with its walls
when inserted therein. The expanded portion is
Figure 3 also showing another step which may be '
machined out throughout the length thereof to
the diameter of the suture.
Figure 7 illustrates the forming of the funnel
shaped mouth for the expanded portion of the ‘
recess shown in Figure 6.
Figures 8 and 9 are views similar to Figure 1 of
then contracted, so that its internal diameter is _
less than that of the suture and its peripheral sur
face substantially ?ush with the peripheral sur
face of the inner unexpanded portion 35 of the
shank, so that a head 8 is provided at the inner
end of the ‘suture, ?tting the inner end portion
of the recess and anchoring the suture in the re
cess. The suture, when placed in the recess, is
modi?ed forms of the needle produced by this
It will be understood that surgeons’ needles are 50 inserted as far as or to near the inner end wall
necessarily of extremely small diameter, and the
which bounds the recess. For the purpose of
suture must be ?rmly attached thereto and that
preventing lateral bending or breaking strains at
when the suture is attached thereto, the shank'
right angles to the axis of the suture when .pull
must be smooth or free from comers or crevices,
ing force is applied to the needle and suture with
and also that the shank of minimum diameter for 55 the needle turned at an angle to the suture, the
entrance end of the recess is formed conical or
beveled or tapered, as at 9 (Figure 3), the conical
or tapering portion starting from a point midway
between the ends of the bore of the expanded por
tion, and ?aring outwardly toward the outer end
of ‘the expanded portion. When the expanded
portion is contracted onto the suture, the walls of
this entrance or conical portion are also con
force applied to the interior of the outer end por-.
tion of the shank in which the partly completed
blind recess is pre-formed.
In any form of the invention, a portion of the
shank is expanded into a diameter greater than
its original diameter and this portion contracted
after being formed with a blind recess, into a
diameter less than the diameter of the suture and
tracted to fit onto the suture, as shown in Figure
with its peripheral surface back into its original
1, and also in Figures 8 and 9.
10 diameter, so that it is ?ush with the adjacent por
As seen in Figures 4, 5, 6 and 7, the shank 2
tion of the shank. Thus, a suture is ?rmly
may be ?rst formed with an incomplete blind
anchored to the needle without unduly weakening
recess Ill, and then the outer portion 4 of the
the needle, that is, removing a minimum of metal
shank expanded and the blind recess 1 com
to form the blind recess, and also owing to the
pleted by boring it out to a diameter substantially 15 contracting of the expanded portion, the recess
that or the suture. The suture is then inserted
may be so formed, as not to require grinding and
in the recess and the expanded portion contracted
minute ?tting of the suture to fit the recess, and
into a diameter-less than the suture. The en
as these sutures are practically a. thread, this
tranceend of the recess is also tapered at 9 so
feature is a great desideratum in the production
that the resulting joint is the same as that shown 20 of surgeons’ needles with the sutures attached.
in Figure 1.
Also, the needles may be formed of minimum
In Figure 8, a modi?cation of the joint between
diameter with the maximum amount of metal an
the shank and the suture is shown, in which the
with the suture of maximum diameter.
shank is ?rst formed with a cylindrical blind
What I claim is:
recess and then expanded into conical form with 25
The method of attaching sutures to the
the larger diameter at the outer end of the shank,
shanks of surgeons’ needles including expanding
making the recess conical, the conical recess then
the outer butt end cylindrical portion’ only of the
bored out substantially cylindrical to the diam
needle shank radially to a larger diameter than
eter of the suture; the suture inserted, and the
the remaining portion, boring a blind axial
outer conical portion contracted onto the suture 30 cylindrical recess in said outer end portion of the
to its outer original diameter, thus forming the
- shank through the expanded portion and into
recess conical with its end of smaller diameter
the adjacent unexpanded portion of the shank,
toward the outer end of the shank, all as de
the recess being of substantially the same diam
scribed in connection with Figures 4, 5, 6 and '7,
eter as the'suture, whereby the cylindrical wall
or the solid shank may be expanded or upset into 35 of the portion of the recess in the unexpanded
conical form with the end of larger diameter ‘at
portion of the shank adjacent the expanded por
the outer end of the shank, and the recess bored
tion is of less thickness than the wall of the recess
out to substantially the diameter of the suture;
in the expanded portion; placing the suture in the
'the suture inserted and the conical portion con
recess approximately to the inner end wall of the
tracted, as described in connection with Figures 40 recess and contracting the expanded portion
2 and 3.
radially onto the suture, so that the inner diam
In Figure 9, the initial expansion is conical, as
eter of the contracted portion is less than that of
described in connection with Figure 8, but to a
the normal diameter of the suture and so that
greater diameter than in Figure 8 and the wall of v
the outer face of the now contracted portion is
the bore bored out in a plural number of steps of 45 ?ush with the outer face of the adjacent unex
different diameters. Thus, when the expanded
panded portion of the shank, whereby the portion
portion is contracted to its original external
of the suture in the inner end portion of the
diameter and its internal diameter to less than the
recess provides an anchoring head for the suture
diameter of the suture, the suture is contracted
and thevwall of the contracted portion is thicker
at a plurality of points or rings.
50 than the wall of the inner end portion of the
In the form shown in Figures 4 and 5, the piece
recess, and provides an internal collar against
is expanded from the form shown in Figure 4 to
which the head pulls.
that shown in Figure 5 by a radial expanding
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